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Message started by slicknick on 01/26/09 at 13:37:41

Title: Backfiring?
Post by slicknick on 01/26/09 at 13:37:41

Decided to take the bike out for a ride today and noticed that when I was in 3rd/4th gear and down-throttled without using the clutch, the minor growls from the exhaust would sometimes let off a much bigger backfire. I mean, its loud enough to turn heads.

I was just wondering if anybody else had this problem and how did you fix it? Perhaps the choke needs to be adjusted?

Title: Re: Backfiring?
Post by T Mack 1 on 01/26/09 at 13:42:08

Cool weather the bike runs leaner.  

Can you tweak the low speed mixture?  Did you do the mod to remove the brass plug?

Title: Re: Backfiring?
Post by verslagen1 on 01/26/09 at 13:43:31

Why would you want to tune that out?  jk   ;D

Air leaks are more prone to cause decel kerpows, check for loose header bolts or muf clamp.

richen the pilot jet a little.

choke should be adjusted in.

Title: Re: Backfiring?
Post by slicknick on 01/26/09 at 13:47:55

I really have no idea what you guys are talking about as far as low speed mixtures, decal kerpows lol, loose header bolts or muf clamps.

Not a mechanic, go figure.

Title: Re: Backfiring?
Post by verslagen1 on 01/26/09 at 15:21:11

Hey slick, you should learn the basics just so when you take it to a mechanic you can tell if he's fixing the thingamabob or the dohicky.  Just a consequence of life that some will try to cheat ya and some don't know what the hell they are doing.

One guy here took his bike in for a new tire (or something like that)  In trying to remove the front wheel, bubba decide the axle was stuck.  Went and got himself a BIG hammer and started wailing on it.  The thunderour clamour sent the owner into convoltions.  As he staggered over to where bubba was working on his bike, he shouts WTF are you doing?  duh axle stuck, getting loose wit hammer.  Did you loosen the pinch bolt?  duh whats that?

You probably don't know either, but you should learn.  You should pour over the owners manual, and glance over Clymers.  Try and figure out what every thing is.  Don't be entirely afraid to ask questions, figure on getting a few thumps and rashes from a few trick answers like 'did you change the air in your tires?'  They are meant to make you think while getting a chuckle.  If you think about it, you can catch me and have a laugh yourself.

So the answer to your question is in Clymers, there's a copy in the tech section.  Seek and ye shall find.

Title: Re: Backfiring?
Post by Prophet_10 on 01/28/09 at 08:47:12

just change the turn signal fluid

Title: Re: Backfiring?
Post by diamond jim on 01/28/09 at 08:53:12

Mine started the little backfiring on decel a few weeks ago.  Mine is a combo of cool weather and the small exhaust leak where the sportster muffler mounts to the header.  

Title: Re: Backfiring?
Post by slicknick on 01/28/09 at 09:19:42


70524F504845547F1110200 wrote:
just change the turn signal fluid


oh crap! i better get to the auto parts store and get somemore blinker fluid. your a hero!

Title: Re: Backfiring?
Post by Gamma742 on 01/28/09 at 09:32:45

Do like me.. I didn't post here until I read through all the technical section. now I done all the stuff except the cone air cleaner mod. I'll do that next On second thought.. I think I'll do Old Feller's budget air filter instead.

Title: Re: Backfiring?
Post by EssForty on 01/30/09 at 15:28:19


7F6863686A6C64690D0 wrote:
I really have no idea what you guys are talking about as far as low speed mixtures, decal kerpows lol, loose header bolts or muf clamps.

Not a mechanic, go figure.



The idle mix screw is an easy mod and can make a big difference. It is documented here in the tech section.

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